. >> my plea to beyonce. maybe i'll sing it. watch and find out. >>> one of the ben filths of having the worldwide resources of nbc news behind you is that you get exclusives like this. the doj memo that explains why it believes it's perfectly legal for the president to kill any american overseas who's a suspected senior terror leader. according to the 16-page memo, the executive branch doesn't have to answer to anyone, not the courts, not congress. no one. it lays out a three-part kill list criteria, step one, informed high level u.s. official has determined the target poses a, quote, iminnocent threat of violent attack and clear evidence of an attack is not required. step two, capture must be, quote, infeasible. and step three, the strike must be conducted according to, quote, laws of war principles. but this isn't a just in case guideline. the targeted killings of u.s. citizens have already happened. september 2011, two were killed in yemen. both were u.s. citizens. yes, it's believed al allaki wa connected to the christmas d